Math Puzzles 2 (With Answers)

Puzzle 1: Which number replaces the question mark?

Answer: 6

Puzzle 2: Which number replaces the question mark?

Answer: 20

Puzzle 3: Which number replaces the question mark?

If 1 =3

    2 = 6

    3 = 9

    4 = 12

Then, 5 = ?

Answer: 15

Puzzle 4: Which number replaces the question mark?

11 x 11 = 4

22 x 22 = 16

33 x 33 = ?

Answer: 36

Puzzle 5: Which number replaces the question mark?

2, 15, 41, 80, ?

Answer: 132